Why I do not have Cortana on my Windows 8.1?

I have a nextbook 2 in 1 windows 8.1 tablet running windows 8.1 with bling. I have read several forums and thought Cortana was possible in the is region but i checked all my settings I cant seem to find it. done all my updates done everything i could think of short from windows 10 testing not sure if i do that if my warranty will hold